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<div class="subTitle">org.apache.commons.math3.stat.descriptive.moment</div>
<h2 title="Class SemiVariance" class="title">Class SemiVariance</h2>
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<li><a href="../../../../../../../org/apache/commons/math3/stat/descriptive/AbstractUnivariateStatistic.html" title="class in org.apache.commons.math3.stat.descriptive">org.apache.commons.math3.stat.descriptive.AbstractUnivariateStatistic</a></li>
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<li>org.apache.commons.math3.stat.descriptive.moment.SemiVariance</li>
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<dd><a href="http://docs.oracle.com/javase/6/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a>, <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/UnivariateStatistic.html" title="interface in org.apache.commons.math3.stat.descriptive">UnivariateStatistic</a>, <a href="../../../../../../../org/apache/commons/math3/util/MathArrays.Function.html" title="interface in org.apache.commons.math3.util">MathArrays.Function</a></dd>
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<pre>public class <span class="strong">SemiVariance</span>
extends <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/AbstractUnivariateStatistic.html" title="class in org.apache.commons.math3.stat.descriptive">AbstractUnivariateStatistic</a>
implements <a href="http://docs.oracle.com/javase/6/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a></pre>
<div class="block"><p>Computes the semivariance of a set of values with respect to a given cutoff value.
 We define the <i>downside semivariance</i> of a set of values <code>x</code>
 against the <i>cutoff value</i> <code>cutoff</code> to be <br/>
 <code>&Sigma; (x[i] - target)<sup>2</sup> / df</code> <br/>
 where the sum is taken over all <code>i</code> such that <code>x[i] < cutoff</code>
 and <code>df</code> is the length of <code>x</code> (non-bias-corrected) or
 one less than this number (bias corrected).  The <i>upside semivariance</i>
 is defined similarly, with the sum taken over values of <code>x</code> that
 exceed the cutoff value.</p>

 <p>The cutoff value defaults to the mean, bias correction defaults to <code>true</code>
 and the "variance direction" (upside or downside) defaults to downside.  The variance direction
 and bias correction may be set using property setters or their values can provided as
 parameters to <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html#evaluate(double[], double, org.apache.commons.math3.stat.descriptive.moment.SemiVariance.Direction, boolean, int, int)"><code>evaluate(double[], double, Direction, boolean, int, int)</code></a>.</p>

 <p>If the input array is null, <code>evaluate</code> methods throw
 <code>IllegalArgumentException.</code>  If the array has length 1, <code>0</code>
 is returned, regardless of the value of the <code>cutoff.</code>

 <p><strong>Note that this class is not intended to be threadsafe.</strong> If
 multiple threads access an instance of this class concurrently, and one or
 more of these threads invoke property setters, external synchronization must
 be provided to ensure correct results.</p></div>
<dl><dt><span class="strong">Since:</span></dt>
  <dd>2.1</dd>
<dt><span class="strong">Version:</span></dt>
  <dd>$Id: SemiVariance.java 1385386 2012-09-16 22:11:15Z psteitz $</dd>
<dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../../../serialized-form.html#org.apache.commons.math3.stat.descriptive.moment.SemiVariance">Serialized Form</a></dd></dl>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.Direction.html" title="enum in org.apache.commons.math3.stat.descriptive.moment">SemiVariance.Direction</a></strong></code>
<div class="block">The direction of the semivariance - either upside or downside.</div>
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<h3>Field Summary</h3>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
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<td class="colFirst"><code>static <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.Direction.html" title="enum in org.apache.commons.math3.stat.descriptive.moment">SemiVariance.Direction</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html#DOWNSIDE_VARIANCE">DOWNSIDE_VARIANCE</a></strong></code>
<div class="block">The DOWNSIDE Direction is used to specify that the observations below
 the cutoff point will be used to calculate SemiVariance</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.Direction.html" title="enum in org.apache.commons.math3.stat.descriptive.moment">SemiVariance.Direction</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html#UPSIDE_VARIANCE">UPSIDE_VARIANCE</a></strong></code>
<div class="block">The UPSIDE Direction is used to specify that the observations above the
 cutoff point will be used to calculate SemiVariance.</div>
</td>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><strong><a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html#SemiVariance()">SemiVariance</a></strong>()</code>
<div class="block">Constructs a SemiVariance with default (true) <code>biasCorrected</code>
 property and default (Downside) <code>varianceDirection</code> property.</div>
</td>
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<td class="colOne"><code><strong><a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html#SemiVariance(boolean)">SemiVariance</a></strong>(boolean&nbsp;biasCorrected)</code>
<div class="block">Constructs a SemiVariance with the specified <code>biasCorrected</code>
 property and default (Downside) <code>varianceDirection</code> property.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html#SemiVariance(boolean, org.apache.commons.math3.stat.descriptive.moment.SemiVariance.Direction)">SemiVariance</a></strong>(boolean&nbsp;corrected,
            <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.Direction.html" title="enum in org.apache.commons.math3.stat.descriptive.moment">SemiVariance.Direction</a>&nbsp;direction)</code>
<div class="block">Constructs a SemiVariance with the specified <code>isBiasCorrected</code>
 property and the specified <code>Direction</code> property.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html#SemiVariance(org.apache.commons.math3.stat.descriptive.moment.SemiVariance.Direction)">SemiVariance</a></strong>(<a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.Direction.html" title="enum in org.apache.commons.math3.stat.descriptive.moment">SemiVariance.Direction</a>&nbsp;direction)</code>
<div class="block">Constructs a SemiVariance with the specified <code>Direction</code> property
 and default (true) <code>biasCorrected</code> property</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html#SemiVariance(org.apache.commons.math3.stat.descriptive.moment.SemiVariance)">SemiVariance</a></strong>(<a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html" title="class in org.apache.commons.math3.stat.descriptive.moment">SemiVariance</a>&nbsp;original)</code>
<div class="block">Copy constructor, creates a new <code>SemiVariance</code> identical
 to the <code>original</code></div>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<td class="colFirst"><code><a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html" title="class in org.apache.commons.math3.stat.descriptive.moment">SemiVariance</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html#copy()">copy</a></strong>()</code>
<div class="block">Returns a copy of the statistic with the same internal state.</div>
</td>
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<tr class="rowColor">
<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html#copy(org.apache.commons.math3.stat.descriptive.moment.SemiVariance, org.apache.commons.math3.stat.descriptive.moment.SemiVariance)">copy</a></strong>(<a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html" title="class in org.apache.commons.math3.stat.descriptive.moment">SemiVariance</a>&nbsp;source,
    <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html" title="class in org.apache.commons.math3.stat.descriptive.moment">SemiVariance</a>&nbsp;dest)</code>
<div class="block">Copies source to dest.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html#evaluate(double[], double)">evaluate</a></strong>(double[]&nbsp;values,
        double&nbsp;cutoff)</code>
<div class="block">Returns the <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html" title="class in org.apache.commons.math3.stat.descriptive.moment"><code>SemiVariance</code></a> of the designated values against the cutoff, using
 instance properties variancDirection and biasCorrection.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html#evaluate(double[], double, org.apache.commons.math3.stat.descriptive.moment.SemiVariance.Direction)">evaluate</a></strong>(double[]&nbsp;values,
        double&nbsp;cutoff,
        <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.Direction.html" title="enum in org.apache.commons.math3.stat.descriptive.moment">SemiVariance.Direction</a>&nbsp;direction)</code>
<div class="block">Returns the <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html" title="class in org.apache.commons.math3.stat.descriptive.moment"><code>SemiVariance</code></a> of the designated values against the cutoff in the
 given direction, using the current value of the biasCorrection instance property.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html#evaluate(double[], double, org.apache.commons.math3.stat.descriptive.moment.SemiVariance.Direction, boolean, int, int)">evaluate</a></strong>(double[]&nbsp;values,
        double&nbsp;cutoff,
        <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.Direction.html" title="enum in org.apache.commons.math3.stat.descriptive.moment">SemiVariance.Direction</a>&nbsp;direction,
        boolean&nbsp;corrected,
        int&nbsp;start,
        int&nbsp;length)</code>
<div class="block">Returns the <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html" title="class in org.apache.commons.math3.stat.descriptive.moment"><code>SemiVariance</code></a> of the designated values against the cutoff
 in the given direction with the provided bias correction.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html#evaluate(double[], int, int)">evaluate</a></strong>(double[]&nbsp;values,
        int&nbsp;start,
        int&nbsp;length)</code>
<div class="block">Returns the <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html" title="class in org.apache.commons.math3.stat.descriptive.moment"><code>SemiVariance</code></a> of the designated values against the mean, using
 instance properties varianceDirection and biasCorrection.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html#evaluate(double[], org.apache.commons.math3.stat.descriptive.moment.SemiVariance.Direction)">evaluate</a></strong>(double[]&nbsp;values,
        <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.Direction.html" title="enum in org.apache.commons.math3.stat.descriptive.moment">SemiVariance.Direction</a>&nbsp;direction)</code>
<div class="block">This method calculates <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html" title="class in org.apache.commons.math3.stat.descriptive.moment"><code>SemiVariance</code></a> for the entire array against the mean, using
 the current value of the biasCorrection instance property.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.Direction.html" title="enum in org.apache.commons.math3.stat.descriptive.moment">SemiVariance.Direction</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html#getVarianceDirection()">getVarianceDirection</a></strong>()</code>
<div class="block">Returns the varianceDirection property.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html#isBiasCorrected()">isBiasCorrected</a></strong>()</code>
<div class="block">Returns true iff biasCorrected property is set to true.</div>
</td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html#setBiasCorrected(boolean)">setBiasCorrected</a></strong>(boolean&nbsp;biasCorrected)</code>
<div class="block">Sets the biasCorrected property.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html#setVarianceDirection(org.apache.commons.math3.stat.descriptive.moment.SemiVariance.Direction)">setVarianceDirection</a></strong>(<a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.Direction.html" title="enum in org.apache.commons.math3.stat.descriptive.moment">SemiVariance.Direction</a>&nbsp;varianceDirection)</code>
<div class="block">Sets the variance direction</div>
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<h3>Methods inherited from class&nbsp;org.apache.commons.math3.stat.descriptive.<a href="../../../../../../../org/apache/commons/math3/stat/descriptive/AbstractUnivariateStatistic.html" title="class in org.apache.commons.math3.stat.descriptive">AbstractUnivariateStatistic</a></h3>
<code><a href="../../../../../../../org/apache/commons/math3/stat/descriptive/AbstractUnivariateStatistic.html#evaluate()">evaluate</a>, <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/AbstractUnivariateStatistic.html#evaluate(double[])">evaluate</a>, <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/AbstractUnivariateStatistic.html#getData()">getData</a>, <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/AbstractUnivariateStatistic.html#getDataRef()">getDataRef</a>, <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/AbstractUnivariateStatistic.html#setData(double[])">setData</a>, <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/AbstractUnivariateStatistic.html#setData(double[], int, int)">setData</a>, <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/AbstractUnivariateStatistic.html#test(double[], double[], int, int)">test</a>, <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/AbstractUnivariateStatistic.html#test(double[], double[], int, int, boolean)">test</a>, <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/AbstractUnivariateStatistic.html#test(double[], int, int)">test</a>, <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/AbstractUnivariateStatistic.html#test(double[], int, int, boolean)">test</a></code></li>
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<h3>Methods inherited from class&nbsp;java.lang.<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3>
<code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</a></code></li>
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<pre>public static final&nbsp;<a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.Direction.html" title="enum in org.apache.commons.math3.stat.descriptive.moment">SemiVariance.Direction</a> UPSIDE_VARIANCE</pre>
<div class="block">The UPSIDE Direction is used to specify that the observations above the
 cutoff point will be used to calculate SemiVariance.</div>
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<pre>public static final&nbsp;<a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.Direction.html" title="enum in org.apache.commons.math3.stat.descriptive.moment">SemiVariance.Direction</a> DOWNSIDE_VARIANCE</pre>
<div class="block">The DOWNSIDE Direction is used to specify that the observations below
 the cutoff point will be used to calculate SemiVariance</div>
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<pre>public&nbsp;SemiVariance()</pre>
<div class="block">Constructs a SemiVariance with default (true) <code>biasCorrected</code>
 property and default (Downside) <code>varianceDirection</code> property.</div>
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<pre>public&nbsp;SemiVariance(boolean&nbsp;biasCorrected)</pre>
<div class="block">Constructs a SemiVariance with the specified <code>biasCorrected</code>
 property and default (Downside) <code>varianceDirection</code> property.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>biasCorrected</code> - setting for bias correction - true means
 bias will be corrected and is equivalent to using the argumentless
 constructor</dd></dl>
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<pre>public&nbsp;SemiVariance(<a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.Direction.html" title="enum in org.apache.commons.math3.stat.descriptive.moment">SemiVariance.Direction</a>&nbsp;direction)</pre>
<div class="block">Constructs a SemiVariance with the specified <code>Direction</code> property
 and default (true) <code>biasCorrected</code> property</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>direction</code> - setting for the direction of the SemiVariance
 to calculate</dd></dl>
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<pre>public&nbsp;SemiVariance(boolean&nbsp;corrected,
            <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.Direction.html" title="enum in org.apache.commons.math3.stat.descriptive.moment">SemiVariance.Direction</a>&nbsp;direction)</pre>
<div class="block">Constructs a SemiVariance with the specified <code>isBiasCorrected</code>
 property and the specified <code>Direction</code> property.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>corrected</code> - setting for bias correction - true means
 bias will be corrected and is equivalent to using the argumentless
 constructor</dd><dd><code>direction</code> - setting for the direction of the SemiVariance
 to calculate</dd></dl>
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<pre>public&nbsp;SemiVariance(<a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html" title="class in org.apache.commons.math3.stat.descriptive.moment">SemiVariance</a>&nbsp;original)
             throws <a href="../../../../../../../org/apache/commons/math3/exception/NullArgumentException.html" title="class in org.apache.commons.math3.exception">NullArgumentException</a></pre>
<div class="block">Copy constructor, creates a new <code>SemiVariance</code> identical
 to the <code>original</code></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>original</code> - the <code>SemiVariance</code> instance to copy</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../../../org/apache/commons/math3/exception/NullArgumentException.html" title="class in org.apache.commons.math3.exception">NullArgumentException</a></code> - if original is null</dd></dl>
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<h4>copy</h4>
<pre>public&nbsp;<a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html" title="class in org.apache.commons.math3.stat.descriptive.moment">SemiVariance</a>&nbsp;copy()</pre>
<div class="block">Returns a copy of the statistic with the same internal state.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../../../org/apache/commons/math3/stat/descriptive/UnivariateStatistic.html#copy()">copy</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../org/apache/commons/math3/stat/descriptive/UnivariateStatistic.html" title="interface in org.apache.commons.math3.stat.descriptive">UnivariateStatistic</a></code></dd>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../../../org/apache/commons/math3/stat/descriptive/AbstractUnivariateStatistic.html#copy()">copy</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../../org/apache/commons/math3/stat/descriptive/AbstractUnivariateStatistic.html" title="class in org.apache.commons.math3.stat.descriptive">AbstractUnivariateStatistic</a></code></dd>
<dt><span class="strong">Returns:</span></dt><dd>a copy of the statistic</dd></dl>
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<a name="copy(org.apache.commons.math3.stat.descriptive.moment.SemiVariance, org.apache.commons.math3.stat.descriptive.moment.SemiVariance)">
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<pre>public static&nbsp;void&nbsp;copy(<a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html" title="class in org.apache.commons.math3.stat.descriptive.moment">SemiVariance</a>&nbsp;source,
        <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html" title="class in org.apache.commons.math3.stat.descriptive.moment">SemiVariance</a>&nbsp;dest)
                 throws <a href="../../../../../../../org/apache/commons/math3/exception/NullArgumentException.html" title="class in org.apache.commons.math3.exception">NullArgumentException</a></pre>
<div class="block">Copies source to dest.
 <p>Neither source nor dest can be null.</p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>source</code> - SemiVariance to copy</dd><dd><code>dest</code> - SemiVariance to copy to</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../../../org/apache/commons/math3/exception/NullArgumentException.html" title="class in org.apache.commons.math3.exception">NullArgumentException</a></code> - if either source or dest is null</dd></dl>
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<h4>evaluate</h4>
<pre>public&nbsp;double&nbsp;evaluate(double[]&nbsp;values,
              int&nbsp;start,
              int&nbsp;length)
                throws <a href="../../../../../../../org/apache/commons/math3/exception/MathIllegalArgumentException.html" title="class in org.apache.commons.math3.exception">MathIllegalArgumentException</a></pre>
<div class="block"><p>Returns the <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html" title="class in org.apache.commons.math3.stat.descriptive.moment"><code>SemiVariance</code></a> of the designated values against the mean, using
 instance properties varianceDirection and biasCorrection.</p>

 <p>Returns <code>NaN</code> if the array is empty and throws
 <code>IllegalArgumentException</code> if the array is null.</p></div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../../../org/apache/commons/math3/stat/descriptive/UnivariateStatistic.html#evaluate(double[], int, int)">evaluate</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../org/apache/commons/math3/stat/descriptive/UnivariateStatistic.html" title="interface in org.apache.commons.math3.stat.descriptive">UnivariateStatistic</a></code></dd>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../../../org/apache/commons/math3/util/MathArrays.Function.html#evaluate(double[], int, int)">evaluate</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../org/apache/commons/math3/util/MathArrays.Function.html" title="interface in org.apache.commons.math3.util">MathArrays.Function</a></code></dd>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../../../org/apache/commons/math3/stat/descriptive/AbstractUnivariateStatistic.html#evaluate(double[], int, int)">evaluate</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../../org/apache/commons/math3/stat/descriptive/AbstractUnivariateStatistic.html" title="class in org.apache.commons.math3.stat.descriptive">AbstractUnivariateStatistic</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>values</code> - the input array</dd><dd><code>start</code> - index of the first array element to include</dd><dd><code>length</code> - the number of elements to include</dd>
<dt><span class="strong">Returns:</span></dt><dd>the SemiVariance</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../../../org/apache/commons/math3/exception/MathIllegalArgumentException.html" title="class in org.apache.commons.math3.exception">MathIllegalArgumentException</a></code> - if the parameters are not valid</dd></dl>
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<pre>public&nbsp;double&nbsp;evaluate(double[]&nbsp;values,
              <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.Direction.html" title="enum in org.apache.commons.math3.stat.descriptive.moment">SemiVariance.Direction</a>&nbsp;direction)
                throws <a href="../../../../../../../org/apache/commons/math3/exception/MathIllegalArgumentException.html" title="class in org.apache.commons.math3.exception">MathIllegalArgumentException</a></pre>
<div class="block">This method calculates <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html" title="class in org.apache.commons.math3.stat.descriptive.moment"><code>SemiVariance</code></a> for the entire array against the mean, using
 the current value of the biasCorrection instance property.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>values</code> - the input array</dd><dd><code>direction</code> - the <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.Direction.html" title="enum in org.apache.commons.math3.stat.descriptive.moment"><code>SemiVariance.Direction</code></a> of the semivariance</dd>
<dt><span class="strong">Returns:</span></dt><dd>the SemiVariance</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../../../org/apache/commons/math3/exception/MathIllegalArgumentException.html" title="class in org.apache.commons.math3.exception">MathIllegalArgumentException</a></code> - if values is null</dd></dl>
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<pre>public&nbsp;double&nbsp;evaluate(double[]&nbsp;values,
              double&nbsp;cutoff)
                throws <a href="../../../../../../../org/apache/commons/math3/exception/MathIllegalArgumentException.html" title="class in org.apache.commons.math3.exception">MathIllegalArgumentException</a></pre>
<div class="block"><p>Returns the <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html" title="class in org.apache.commons.math3.stat.descriptive.moment"><code>SemiVariance</code></a> of the designated values against the cutoff, using
 instance properties variancDirection and biasCorrection.</p>

 <p>Returns <code>NaN</code> if the array is empty and throws
 <code>MathIllegalArgumentException</code> if the array is null.</p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>values</code> - the input array</dd><dd><code>cutoff</code> - the reference point</dd>
<dt><span class="strong">Returns:</span></dt><dd>the SemiVariance</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../../../org/apache/commons/math3/exception/MathIllegalArgumentException.html" title="class in org.apache.commons.math3.exception">MathIllegalArgumentException</a></code> - if values is null</dd></dl>
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<pre>public&nbsp;double&nbsp;evaluate(double[]&nbsp;values,
              double&nbsp;cutoff,
              <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.Direction.html" title="enum in org.apache.commons.math3.stat.descriptive.moment">SemiVariance.Direction</a>&nbsp;direction)
                throws <a href="../../../../../../../org/apache/commons/math3/exception/MathIllegalArgumentException.html" title="class in org.apache.commons.math3.exception">MathIllegalArgumentException</a></pre>
<div class="block"><p>Returns the <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html" title="class in org.apache.commons.math3.stat.descriptive.moment"><code>SemiVariance</code></a> of the designated values against the cutoff in the
 given direction, using the current value of the biasCorrection instance property.</p>

 <p>Returns <code>NaN</code> if the array is empty and throws
 <code>MathIllegalArgumentException</code> if the array is null.</p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>values</code> - the input array</dd><dd><code>cutoff</code> - the reference point</dd><dd><code>direction</code> - the <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.Direction.html" title="enum in org.apache.commons.math3.stat.descriptive.moment"><code>SemiVariance.Direction</code></a> of the semivariance</dd>
<dt><span class="strong">Returns:</span></dt><dd>the SemiVariance</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../../../org/apache/commons/math3/exception/MathIllegalArgumentException.html" title="class in org.apache.commons.math3.exception">MathIllegalArgumentException</a></code> - if values is null</dd></dl>
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<pre>public&nbsp;double&nbsp;evaluate(double[]&nbsp;values,
              double&nbsp;cutoff,
              <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.Direction.html" title="enum in org.apache.commons.math3.stat.descriptive.moment">SemiVariance.Direction</a>&nbsp;direction,
              boolean&nbsp;corrected,
              int&nbsp;start,
              int&nbsp;length)
                throws <a href="../../../../../../../org/apache/commons/math3/exception/MathIllegalArgumentException.html" title="class in org.apache.commons.math3.exception">MathIllegalArgumentException</a></pre>
<div class="block"><p>Returns the <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.html" title="class in org.apache.commons.math3.stat.descriptive.moment"><code>SemiVariance</code></a> of the designated values against the cutoff
 in the given direction with the provided bias correction.</p>

 <p>Returns <code>NaN</code> if the array is empty and throws
 <code>IllegalArgumentException</code> if the array is null.</p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>values</code> - the input array</dd><dd><code>cutoff</code> - the reference point</dd><dd><code>direction</code> - the <a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.Direction.html" title="enum in org.apache.commons.math3.stat.descriptive.moment"><code>SemiVariance.Direction</code></a> of the semivariance</dd><dd><code>corrected</code> - the BiasCorrection flag</dd><dd><code>start</code> - index of the first array element to include</dd><dd><code>length</code> - the number of elements to include</dd>
<dt><span class="strong">Returns:</span></dt><dd>the SemiVariance</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../../../org/apache/commons/math3/exception/MathIllegalArgumentException.html" title="class in org.apache.commons.math3.exception">MathIllegalArgumentException</a></code> - if the parameters are not valid</dd></dl>
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<pre>public&nbsp;boolean&nbsp;isBiasCorrected()</pre>
<div class="block">Returns true iff biasCorrected property is set to true.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the value of biasCorrected.</dd></dl>
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<a name="setBiasCorrected(boolean)">
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<pre>public&nbsp;void&nbsp;setBiasCorrected(boolean&nbsp;biasCorrected)</pre>
<div class="block">Sets the biasCorrected property.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>biasCorrected</code> - new biasCorrected property value</dd></dl>
</li>
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<pre>public&nbsp;<a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.Direction.html" title="enum in org.apache.commons.math3.stat.descriptive.moment">SemiVariance.Direction</a>&nbsp;getVarianceDirection()</pre>
<div class="block">Returns the varianceDirection property.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the varianceDirection</dd></dl>
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<pre>public&nbsp;void&nbsp;setVarianceDirection(<a href="../../../../../../../org/apache/commons/math3/stat/descriptive/moment/SemiVariance.Direction.html" title="enum in org.apache.commons.math3.stat.descriptive.moment">SemiVariance.Direction</a>&nbsp;varianceDirection)</pre>
<div class="block">Sets the variance direction</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>varianceDirection</code> - the direction of the semivariance</dd></dl>
</li>
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